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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

BNA → MDW

Nashville to Chicago: 1,908 nonstop flights a year

On time (12 months)

78%

Cancelled

1.3%

avg delay 12 min

Best time to leave

Before 9 AM

94% on time vs 65% after 9 PM

Most reliable airline

Southwest

77% chance on time

Check BNA to MDW fares

Lowest nonstop fare seen in the next two months: $213 (Southwest 647 on 2026-10-20). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Southwest 690

    5:20 AM → 6:55 AM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    93%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 95% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; After 9 PM: 65%).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).

    Limited track record · 55 flights

    Find Southwest 690 fares Opens this date on Aviasales

  2. #2 · Southwest 2030

    5:10 AM → 6:45 AM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    88%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; After 9 PM: 65%).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).

    Limited track record · 32 flights

    Find Southwest 2030 fares Opens this date on Aviasales

  3. #3 · Southwest 991

    7:40 AM → 9:20 AM1h 40m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    84%

    chance on time

    On time (history)
    85%
    Cancelled
    13.0%
    Avg arrival delay
    7 min
    • Arrived on time 85% of the time (20 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; After 9 PM: 65%).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.

    Limited track record · 20 flights

    Find Southwest 991 fares Opens this date on Aviasales

  4. #4 · Southwest 4415

    10:35 AM → 12:10 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 83% of the time (23 flights, Jun 2025 to May 2026).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 4415 fares Opens this date on Aviasales

  5. #5 · Southwest 418

    11:35 AM → 1:10 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    82%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 418 fares Opens this date on Aviasales

  6. #6 · Southwest 1100

    10:10 AM → 11:55 AM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    82%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 85% of the time (20 flights, Jun 2025 to May 2026).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • 61% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 20 flights

    Find Southwest 1100 fares Opens this date on Aviasales

  7. #7 · Southwest 2108

    1:45 PM → 3:20 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    74%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 73% of the time (22 flights, Jun 2025 to May 2026).
    • Departs inside BNA's trouble window: 64% of its 44 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find Southwest 2108 fares Opens this date on Aviasales

  8. #8 · Southwest 2792

    4:00 PM → 5:40 PM1h 40m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    73%

    chance on time

    On time (history)
    74%
    Cancelled
    3.0%
    Avg arrival delay
    14 min
    • Arrived on time 74% of the time (31 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (1 of 33).
    • Departs inside BNA's trouble window: 64% of its 44 ground stops and delay programs started between 1 PM and 7 PM.
    • 51% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 31 flights

    Find Southwest 2792 fares Opens this date on Aviasales

  9. #9 · Southwest 3711

    3:25 PM → 5:00 PM1h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    72%

    chance on time

    On time (history)
    62%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 62% of the time (53 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Departs inside BNA's trouble window: 64% of its 44 ground stops and delay programs started between 1 PM and 7 PM.
    • 54% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 53 flights

    Find Southwest 3711 fares Opens this date on Aviasales

  10. #10 · Southwest 998

    10:15 PM → 12:05 AM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 73% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 65% on time; Before 9 AM: 94%).
    • Departs outside BNA's trouble window (1 PM to 7 PM, when 64% of its 44 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 998 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines77%

    1,908 flights · 78% on time as flown · 1.3% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM94%

    526 flights · avg delay 4 min

  • 9 AM to noon86%

    198 flights · avg delay 7 min

  • Noon to 3 PM77%

    264 flights · avg delay 12 min

  • 3 to 6 PM71%

    329 flights · avg delay 18 min

  • 6 to 9 PM66%

    393 flights · avg delay 20 min

  • After 9 PM65%

    198 flights · avg delay 19 min

Best day: Saturday (88%). Worst: Sunday (77%).

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure